Yes

you do need a jacket based on the weather in Seattle, WA 98115, USA 1 second ago

Why? Because sorry, it's too cool for just a hoodie!
52°F11°C & Mostly Clear

Wind is 2 mph4 km/h from the Northeast, gusting to 4 mph6 km/h
September 15
10am52°F11°C2 mph3 km/h NorthClear
11am54°F12°C2 mph3 km/h NorthwestMostly Clear
12pm57°F14°C2 mph4 km/h NorthClear
1pm60°F16°C2 mph4 km/h NorthClear
2pm63°F17°C3 mph6 km/h NorthClear
3pm66°F19°C6 mph10 km/h NorthMostly Clear
4pm67°F19°C7 mph12 km/h NorthMostly Clear
5pm68°F20°C8 mph13 km/h NorthClear
6pm69°F21°C8 mph13 km/h NorthClear
7pm69°F21°C8 mph14 km/h NorthClear
8pm69°F20°C8 mph13 km/h NorthClear
9pm67°F20°C8 mph13 km/h NorthClear
DateLowHighWindDayNight
September 1551°F11°C69°F21°C6 mph9 km/h from NorthClearClear
September 1655°F13°C83°F28°C4 mph7 km/h from NortheastClearClear
September 1759°F15°C73°F23°C6 mph9 km/h from NorthwestMostly ClearMostly Clear
September 1855°F13°C69°F21°C7 mph11 km/h from NorthPartly CloudyClear
September 1955°F13°C73°F23°C4 mph7 km/h from NorthClearMostly Clear
September 2054°F12°C70°F21°C4 mph7 km/h from SouthPartly CloudyDrizzle
September 2156°F13°C68°F20°C5 mph8 km/h from SouthDrizzlePartly Cloudy

Yes

Low of 55°F13°C, High of 83°F29°C
Wind: 4 mph7 km/h
Precipitation: None

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